used in both physical and human geography

area of still water created by an impediment to drainage e.g. a sediment bar across an ox-bow lake.

a class of organisms known as Prokaryotes in which the cell has no nucleus. They are single-cell microbes which can be found virtually everywhere. They 'eat' almost anything which lends them [..]

gently sloping plain formed when a number of alluvial fans exiting closely spaced wadis in desert areas coalesce into a larger feature.

net sum of a country income from and expenditure on foreign trade which can run to a surplus or a deficit.

the net sum of imports and exports of visible goods. Forms part of the balance of payments along with the same calculation for invisibles.

the maximum discharge that a particular river channel is capable of carrying without flooding.

a pyrophitic tree found in savannah areas. It has an enormous trunk which stores water and tiny leaves to minimize evapotranspiration.

see sand bar.

crescent-shaped sand dune which form in desert areas experiencing generally constant winds. The 'horns' of the crescent point downwind, having moved ahead more rapidly, where they become she [..]